JP2001359043A - Recording device and recording method - Google Patents

Abstract

(57) [Problem] To provide a recording device and a recording method capable of effectively preventing unauthorized copying of video information. SOLUTION: While writing to a disk 2, it is detected whether or not the write data is video information. If video information is detected, a digital watermark embedded in the video information is detected. When the information is detected and the copy control information of the digital watermark information is other than “copy free”, writing of data to the disk 2 is interrupted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording apparatus and a recording method for recording, on a recording medium such as a DVD-RAM, data in which digital watermark information having copy control information is embedded in a video signal.

[0002]

2. Description of the Related Art In a recently developed recording medium such as a DVD-RAM, a large amount of data of, for example, a movie can be recorded as digital information on a single medium. As digital information can be recorded, it becomes increasingly important to prevent unauthorized copying and protect the copyright holder.

[0003] For example, Japanese Patent Application Laid-Open No. H11-155125 discloses a technique for preventing unauthorized copying of video information. This is to prohibit the output of information read from the disc from the playback device to the recording device side in the playback device when the copy control information of the digital watermark information embedded in the video signal is copy prohibited. It is.

[0004]

However, in a reproducing apparatus which does not have a function of controlling copy prohibition or the like using digital watermark information, unauthorized copying can be easily performed and protection of video information becomes insufficient. There is a risk.

[0005] The present invention has been made in view of such circumstances, and has as its object to provide a recording apparatus and a recording method capable of effectively preventing unauthorized copying of video information.

[0006]

In order to achieve the above object, a main aspect of the present invention is a recording apparatus capable of recording data in which digital watermark information having copy control information is embedded in a video signal on a recording medium. A detection unit for detecting whether the data to be recorded is a video signal; a detection unit for detecting digital watermark information from the video signal when the video signal is detected; and Regulating means for regulating the recording of the video signal on the recording medium based on the copy control information of the watermark information.

According to the present invention, it is detected whether or not the data to be recorded is a video signal, and if the data is a video signal, the digital watermark information embedded in the video signal is detected, and based on the copy control information of the detected digital watermark information. Since the recording of the video signal on the recording medium is regulated, illegal copying of the video information can be effectively prevented.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 relates to one embodiment of the present invention,
FIG. 2 is a block diagram illustrating a configuration of an optical disk device that reproduces and records an optical disk such as a DVD-RAM.

As shown in FIG. 1, a disk 2 to be reproduced / recorded is loaded on a turntable 1, and the disk 2 is rotated by rotating the turntable 1 by a spindle motor 3.

An optical pickup 4 for irradiating the rotating disk 2 with laser light and extracting information from the reflected light or recording information with the irradiated light is provided by a so-called thread mechanism (not shown). It is slidable in the radial direction of the disc.

The signal read / write circuit 5 demodulates and decodes the signal read by the optical pickup 4 to obtain a signal that can be transferred to the host 6 and encodes the data transferred from the host 6. The signal is converted into a signal recordable on the disk 2 by a conversion process and a modulation process.

The interface controller 7 buffers read data transferred from the signal read / write circuit 5 and write data transferred from the host 6, and exchanges commands with the host 6. SCSI / AT based on command
The read data and the write data are exchanged with the host 6 via the interface 8 such as API / IEEE1394.

The MPEG-2 video bit stream (V
The video bit stream detection circuit 9 outputs the data transferred from the host 6 and output from the interface controller 7 to the signal read / write circuit 5 to the MPEG-2 Video Bit.
It is detected whether it is a stream or not. More specifically, the MPEG-2 video bit stream detection circuit 9
Is, for example, Program S included in the above data.
stream (PS) or Transport Street
am (TS) to Packetized Elemen
Extract the target stream (PES)
acknowledgmented ElementaryStream
m (PES), the data is MPEG-2 V
It detects whether or not it is an video bit stream, that is, whether or not it is a video signal.

The digital watermark detection circuit 10 is an MPEG-2
The signal read / write circuit 5 from the interface controller 7 by the video bit stream detection circuit 9
Data output to MPEG-2 Video Bi
If it is detected that the stream is MPEG-4, the MPEG-
2 video bit stream detection circuit 9 to MPEG-2
It receives the Video Bit Stream, detects digital watermark information embedded in the MPEG-2 Video Bit Stream, and recognizes the contents of the digital watermark information.

Here, the digital watermark information is, for example, as disclosed in Japanese Patent Application Laid-Open No. H11-155125.
The luminance signal of the video signal is processed within a range in which the luminance of the video signal does not visually affect much, and information is embedded in the video signal. The digital watermark information includes copy control information. The copy control information includes “copy free”, “copy once”, “no more copy is impossible (No More Copy)”, and “copy prohibited”. There is information of.

The data write determination circuit 11 outputs a result to the interface controller 7 according to the logic shown in Table 1 below.

[0017]

[Table 1]

Next, the operation of the optical disk apparatus configured as described above will be described. Interface controller 7
Is a read command (READ com) from the host 6 side.
Upon receiving the command (mand.), the spindle motor 3 is rotated and the optical pickup 4 reads out signals from the disk 2 while performing focus / tracking servo. The read signal is subjected to demodulation processing and decoding processing by the signal read / write circuit 5 to be data that can be transferred to the host 6 side. This data is buffered by the interface controller 7 and transferred to the host 6 via the interface 8.

The interface controller 7 receives a write command (WRITE command) from the host 6 side.
When d) is received, data transferred from the host 6 via the interface 8 is buffered. The buffered data is encoded and modulated by the signal read / write circuit 5 to be a signal recordable on the disk 2. This signal is written on the disk 2 while rotating the spindle motor 3 and performing focus / tracking servo by the optical pickup 4.

When writing such a signal, as shown in FIG. 2, the MPEG-2 video bit stream detection circuit 9 outputs the signal from the interface controller 7 to the signal read / write circuit 5. Write data is MPEG-2 Video Bit
It is detected whether it is a stream (step 201). Then, the MPEG-2 video bit stream detection circuit 9 determines that the write data is MPEG-2 Vi.
MPEG in case of "deo Bit Stream"
-2 Video Bit Stream is sent to the digital watermark detection circuit 10.

In the digital watermark detection circuit 10, the MPEG-
2 video bit stream detection circuit 9 to MPEG-2
Upon receiving the Video Bit Stream, the digital watermark information embedded in the MPEG-2 Video Bit Stream is detected (step 2).
02), it is recognized whether the copy control information of the digital watermark information is “copy free”, “copy once”, “copy no more” or “copy prohibited” (step 203). The recognition result is sent to the data write determination circuit 11. Note that the MPEG-2 Video B stream detection circuit 9 sends the MPEG-2 Video B
The electronic watermark detection circuit 1
In some cases, the digital watermark information cannot be determined unless it is continuously input to 0. In such a transitional period until the determination, the recognition result is treated as “copy free”. The write data output from the interface controller 7 to the signal read / write circuit 5 is MPEG-2 Vi.
If the video bitstream is not a video Bitstream, the
The 2 video bit stream detection circuit 9 does not send data to the digital watermark detection circuit 10. The recognition result of the digital watermark detection circuit 10 at this time is treated as “copy free”.

If the copy control information sent from the digital watermark detection circuit 10 is "copy free" (step 204), the data writing judgment circuit 11 executes an interface controller so as to write data to the disk 2. 7, the interface controller 7 continues writing to the disk 2 (step 205), and the host 6 side issues a write command (WRITE).
command) will be completed normally. On the other hand, the data writing determination circuit 11 determines that the copy control information sent from the digital watermark detection circuit 10 is “copy free”.
In other cases, that is, in the case of "copy once", "copy no more" and "copy prohibited" (step 204), the interface controller 7 interrupts the writing of data to the disk 2. Then, the interface controller 7 interrupts the writing to the disk 2 (step 206). In this case, a write command (WRITE command) from the host 6 side
In order to inform d) that the command could not be completed, the interface controller 7 sends a check condition status (Chec) to the host 6 side.
Indicate that the command was aborted in k Condition status.

Here, when the host 6 is notified that the data writing has been interrupted, a predetermined display, for example, a display indicating that illegal copying is prohibited may be made. Thereby, the user can recognize that the act that is currently being executed is an illegal act.

When the host 6 is informed of such an interruption, a command for erasing the video signal already recorded on the disk 2 is transmitted to the interface controller 7, and such a command is transmitted to the interface controller 7. Erase may be performed. Thus, the video signal that has been illegally copied to the disk 2 before the interruption of the writing can be completely erased.

As described above, according to the present embodiment, the writing of the video signal to the disc 2 is regulated based on the copy control information of the digital watermark information embedded in the video signal. Even when a means for restricting unauthorized copying based on copy control information of digital watermark information is not provided, unauthorized copying of video information can be effectively prevented.

The present invention is not limited to the above embodiment. For example, in the above-described embodiment, a DVD-RAM is described as an example of a recording medium.
The present invention can be applied to other recording media such as VD-R, DVD-RW and DVD + RW.

[0027]

As described above, according to the present invention,
Since illegal copying of video information can be effectively prevented, it is possible to prevent creation of a recording medium on which video information is recorded by illegal means, thereby protecting the interests of the copyright holder of the video information. .

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of an optical disc device according to an embodiment of the present invention.

FIG. 2 is a flowchart showing a write restricting operation in the optical disk device shown in FIG.

[Explanation of symbols]

 Reference Signs List 1 turntable 2 disk 3 spindle motor 4 optical pickup 5 signal read / write circuit 6 host 7 interface controller 8 interface 9 MPEG-2 video bit stream detection circuit 10 electronic watermark detection circuit 11 data write determination circuit

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5C052 AA02 AA04 AB03 CC06 CC11 DD04 5C053 FA13 FA15 FA24 GB06 GB38 HA33 JA21 KA24 LA11 5D044 AB07 BC04 CC06 DE50 EF05 FG18 GK12 GK20 HH13 HL08 HL11

Claims (8)

[Claims] 1. A recording device capable of recording, on a recording medium, data in which digital watermark information having copy control information is embedded in a video signal, wherein the recording device detects whether the data to be recorded is a video signal. Means for detecting digital watermark information from the video signal when the video signal is detected; and recording the video signal on the recording medium based on copy control information of the detected digital watermark information. And a regulating means for regulating the pressure. 2. The recording apparatus according to claim 1, wherein the copy control information includes “copy free”, “copy once”, “copy no more”, and “copy prohibited”. There is information, the restricting means, when the copy control information is "copy free", causes the recording to be performed on the recording medium,
When the copy control information is "copy once", "copy is no more possible" or "copy prohibited", the recording on the recording medium is interrupted. 3. A recording device capable of recording, on a recording medium, data in which digital watermark information having copy control information is embedded in a video signal, comprising: a host for transferring data; An interface controller for transferring the transferred data; a recording unit for recording data transferred via the interface controller on a recording medium; and a video signal for transferring the data transferred via the interface controller. Detecting means for detecting whether or not the video signal is detected; detecting means for detecting digital watermark information from the video signal when the video signal is detected; and the recording medium based on the copy control information of the detected digital watermark information. A recording unit for restricting recording of the video signal to the recording apparatus. 4. The recording apparatus according to claim 3, wherein the copy control information includes “copy free”, “copy once”, “copy no more”, and “copy prohibited”. There is information, the restricting means, when the copy control information is "copy free", causes the recording to be performed on the recording medium,
When the copy control information is "copy once", "copy is no more possible" or "copy prohibited", the recording on the recording medium is interrupted. 5. The recording apparatus according to claim 4, wherein, when the recording on the recording medium is interrupted, the interface controller informs the host that the recording has been interrupted. apparatus. 6. The recording apparatus according to claim 5, wherein the host is notified that the interruption has occurred,
A recording device for performing a predetermined display. 7. The recording apparatus according to claim 5, wherein the host is notified that the interruption has occurred,
A recording apparatus for transmitting a command for erasing a video signal already recorded on a recording medium to the interface controller. 8. A recording method capable of recording data in which digital watermark information having copy control information is embedded in a video signal on a recording medium, wherein a step of detecting whether the data to be recorded is a video signal or not. Detecting the digital watermark information from the video signal when the video signal is detected; and controlling the recording of the video signal on the recording medium based on the copy control information of the detected digital watermark information. A recording method.